RT to disable the screensaver when watching a video

I have a small feature request. This may strech beyond the purpose of Rescure Time a little bit, but still...

On XP, I usually set my screen saver to switch on after 10 minutes of inactivity. When watching a video, most if not all browsers or video players do NOT control the screensaver and after 10 minutes of watching the video (even full screen), the screen saver will activate. So I have to manually change "10 minutes" to "180 minutes" to avoid the screen saver to pop up when watching a movie.

As RescueTime is tracking in real time the activity on my PC, it detects when I start watching a video (at least I hope it does). So could you add a few lines of code to dis-able the screen saver as long as I am watching a video? This would be very helpful.

Alternatively, do you know of some good freeware that does that? The only one I know of that partially handles this is the video player smplayer, but I am looking for a more generic application that also handles the case where the video is played inside a browser.